Device for seizing, positioning, and tying of starting end of yarn to be wound



May 10, 1960 w. REINERS ETAL 2,936,130

DEVICE FOR SEIZING, POSITIONING, AND TYING OF STARTING END OF YARN TO BE WOUND Filed Feb. 14, 1957 2 Sheets-Sheet 1 FIG. I

May 10, 1960 w. REINERS ETAL DEVICE FOR SEIZING, POSITIONING, AND TYING OF STARTING END OF YARN TO BE WOUND FilSd Feb. 14, 1957 24:1 M W" W W a; f H v 401 1 I 102 401 a 2 Sheets-Sheet 2 2,936,130 DEVICE FOR SEIZING, POSITIONING, AND TYING OF STARTING END OF YARN TO BE WOUND Walter Reiners and Stefan Fiirst, M. Gladbach, Germany; said Fiirst assignor to said Reiners Our invention relates to automatic and semi-automatic coil-winding machines for the re-winding of spinning cops and similar coils of yarn hereinafter briefly referred to as cops.

In the operation of such machines the starting end of the yarn on a cop, which yarn is to be wound 01f the cop and on a take-up carrier or spool, is first sought and seized by hand. It is then placed by the attendant into a ready position from which the starting end, at the proper moment, is subsequently conveyed by the machine operation to a tying device. This device knots the starting end together with the end of the yarn coming from, or drawn back from, the body of yarn previously wound onto the take-up carrier. It is also feasible to use an automatic device to pull the starting end off the cop about to be unwound. This device may have a suction gripper which takes the starting end of the yarn from the cop, the starting end being disposed in the form of parallel windings on the core, or core-tube, of the cop. The suction gripper then transfers the yarn end to the above-mentioned tying device. However, if the yarn-end seizing and transferring operations of the just-mentioned type take place within the same interval of time in which the machine automatically replaces an empty cop by the neXt cop to be unwound difiiculty may arise. If trouble should occur in such automatic yarn seizing and transferring operations, the attendant has no opportunity to manually correct the cause of the disturbance, so that faulty products may result, or the machine operation may be stopped by the conventional fault-responsive devices.

It is an object of the preferred form of our invention to eliminate this disadvantage.

According to this preferred form of the invention, the cops which are to be successively unwound are temporarily first disposed or supported in a position and location making them individually ready. From this position they are advanced into the position where the cop is unwound onto the take-up spool. The starting end of the yarn, which forms a number of parallel windings on the core of the cop, is seized and pulled off the cop by a yarn gripper at a time when the cop is still in the just-mentioned ready location and the next preceding cop is not yet fully unwound and hence not yet ready for exchange. The gripper places the yarn end pulled off the cop into a preparatory position which subsequently, at the proper operating moment, permits or facilitates the joining of the leading end of the pulled-off yarn with the trailing end of the body of yarn already wound onto the take-up spool. The method is preferably carried out so that the seizing and pulling-off of the leading yarn end from the cop, then in the ready position, takes place within the coil-exchanging operation next preceding the transfer of the same cop to the uncoiling position of the machine.

According to another feature of our invention, we provide a device for performing the above-described method of operation designed as follows. An automatic coil-winding machine is equipped for receiving the yarn supplying cop, and with a gripper for seeking and seizing the starting end of the yarn on a supply cop then located in ready position within range of the gripper. The gripper seizes the starting end of the thread, which is present on the end of the ready cop core in form of parallel turns, whereafter the gripper conveys the starting end to a given position, from which it is conveyed to a tying device at the proper moment. The seeking and seizing of the starting end takes place at a time when the yarn supplying cop is still located in a feeder magazine.

According to other features of the invention, we provide means which prevent a pulling off of the seized starting end after termination of the automatic yarnfinding operation. More specifically, we provide the device with a yarn-deflecting member which is controlled by the gripper and causes the starting end of the yarn to be pulled off after termination of the automatic yarn-finding operation.

The above-mentioned and more specific objects and features of the invention will be apparent from the embodiment illustrated by Way of example on the drawing and described in the following. On the drawing:

Fig. 1 illustrates an individual coil-winding station of an automatic coilwinding machine;

Fig. 2 shows a detail of the yarn-end finding device;

Fig. 3 is a motion diagram representing the time relation or sequence of the individual motions of various elements; and

Fig. 4 illustrates a detail of the tion.

Figs. 5 and 6 illustrate automatic drive mechanisms for various elements.

Fig. 7 is a detail plan view of the end of lever 20 of Fig. 4, showing cross-arm 200.

The frame structure of the coil-winding machine comprises a tubular standard 1 designed as a suction conduit. Mounted on standard 1 is a rotatable yarn-guiding drum 2, provided with the known guiding groove. A take-up spool 3 is journalled on a frame structure 4, which is pivoted at 5 to the standard 1. The yarn-guiding drum 2 is mounted on a revolvable shaft 6. When drum 2 is driven, it imparts rotation to the body of yarn wound up on spool 3 and at the same time the groove therein guides the oncoming yarn back and forth along the spool 3. A suction tube 7 of arcuate shape is pivoted about a hollow shaft 8, and communicates through the pivot with the interior of the tubular standard 1. The suction tube 7 has a suction opening 79 at its upper end, and can be turned about shaft 8 to the position 7' illustrated by dot and dash lines.

A lever 9, designed as a suction tube and gripper, is pivoted at 10 to the standard 1 and is likewise in communication with the interior of the standard through the pivot. The upper end 11 of lever 9 is designed to receive the yarn. Lever 9, during operation, turns about pivot 10 along a circular path 12 into a position 9' illustrated by dot and dash lines. A lever 13, also of tubular design to operate as a suction tube, is pivoted to standard 1 at hollow pivot means 14. The upper end or head 15 of lever 13 is provided with grippers 16 (Fig. 2). The lever 13, during operation, turns about pivot 14 along a circular path 15' into the position 13' illustrated by dot and dash lines. The head 15 of lever 13 carries noses 17, 18 (Fig. 4) which actuate a yarn-guiding lever 20, 21 pivoted at 19. Pivot 19 is a stationary pivot, being mounted on lug 19d of a stirrup 29.

The suction tube 7, the lever 9 and the lever 13, as mentioned above, are all in communication with the interior of the tubular standard 1. The tubular standard is connected to a vacuum conduit or pump, the air sucyarn-finding operation required for the operation of parts 7, 9 and 13, and others described below, being applied through the hollow standard 1.

Also mounted on the standard 1. are a thread-tensioner 22 and a thread-guiding pin 23. Another yarn-guiding pin 24 is mounted on theopposit'e side of the yarn-tensioner 22. The yarn F coming from the supply cop 25 passes first over the pin- 24, then around the threadtensioner 22, and then under the pin 23 toward the thread-guiding drum 2., whence it passes onto the take-up spool 3.

The yarn-supplying cop 25 is speared on a thorn 27 which is pivoted at 26 on standard 1. Consequently, the cop 25, when in its uncoil-ing position on the thorn, canbe pivoted or rotated about the axis of pivot pin 26; so that it can be turned into the position 25' shown by dot-and-dash lines. Secured to the machine standard 1 is a magazine. 26' which accommodates a number or reserve cops such as those denoted by 25a and 25b. These cops havea core, such as a tube of paper or cardboard, which projects out of the body of yarn. the upper end of each co'r'e are a number of parallel turns 28 constituting the starting end of the yarn. The

magazine is provided with two parallel guiding stirrups 29 which support the cops at their upper ends, whereas the bottom. portion of the magazine 26' sl-idably guides the lower ends of the cops so that they tend to travel by gravity toward a lowermost stop position. A stop 31 mounted on, a horizontal pivot pin 30 retains the lowermost cop 25b in magazine 26' in a predetermined ready pois'tion. The. stop 31 is actuated by a crank arm 32 under control a: rod 33; the stop 3-1 being retracted or tilted avvay from: the foot of the cop. The two guiding stirrups 29 located onthe respective sides of the cops have their. front ends: 34 connected with each other to form a curved abutment so disposed that the top portion of the cop 25b cannot move downward further than to the position shown in Fig. 1. Only the foot portion of the lowermostcop 25b in magazine 26, when released by the stop 31, can travel toward the left so that it will slide down. into the position 25'. In this position, the lowermost cop is speared. upon the thorn 27, the latter extending into the lower end of the core.

The yarn end extending from the lowermost cop 25b inmagazine 26:" to the gripper end' 15 of lever '13- is denoted by F. The portion of yarn extending from-lever end 15- to the guiding pin 24 is denoted by F"; During the knotting' operation of a tying device 35, alsomount'ed on. the standard 1, a yarn portion F is formed. The yarn end pulled off the take-up spool during the tyingoperation of device-35 is designated by F"".

In Fig. 3 the lines denoted by 36 to 42 represent the time curves of the respective operations of various com-- ponents of the above-described apparatus. The line 36 indicates the rotation of the yarn-guiding drum 2. Line 37 indicates the angular motion of the suction tube 7, and line 38. the motion of the lever 9. Line 39 indicates the time relation or sequence of the operation of tying device 35 relative to the other components. Line 4 shows the time relation of stop 31, lever 32 and connecting rod 33 relative to the other components. Line 41 indicates the motion of the thorn 27, and line 42 indicates the time curve of the operation of lever 13.

The apparatus operates as follows:

Assume that during the operation of the winding m'a-- chine, the cop 25', then in unwinding position, has run empty: This ac'tuates' the known sensing device, which may be yarn tension responsive the yarn guard turning under'reaction of its own weight; The'empty'core is then automatically eliminated; by turning; the thorn downwardly on its pivot 2' for example, and the lowermost cop 25b is subsequently released from the magazine 26' and speared up onthe thorn 27'which has been moved to the dotted line position of Fig. 1,, as described in the foregoing. This exchange of yarn-supplying coils isi'nitiated Located on spool, 2, take place substantially in the manner described in German Patent 923,415 res'p. US} Patent 2,769,599, to which reference may be had for further details, if' desired. However, the essential operations that take place during the coil exchange interval, will be described presently as far as they are related to the components and functioning of the device according to the present invention, it being understood that conventional drive means described in the prior vpatents and literature is employed.

During the just mentioned coil changing period, the lever 13 moves its end portion 15 along the circular path I5, the lever moving into the position 13", in accordance with the time curve 42 in Fig. 3. When the lever 13 is in its" lowermost position, the gripper 16 (Fig. 2) enters over the pmallel windings 28 forming thestarting end of the coil yarn on cop 25h. Upon the subsequent return movement of lever end 1 5 in the upward direction, the grippers 16; aided by the suction efiect, remove the starting end of the yarn from the cop. The removed yarn is in the position P (Fig. 1) at the end of the return movement. During this operation, the yarn-guiding lever 20 prevents the yarn from being pulled over the head of cop 25b"from the yarn body on' the latter.

The individual movements and the timing sequence or the operation of the components will be further described with reference to diagram Fig; 3. During cop-exchangingoperation, the controls of yarn-guiding dru'ni 2, which guides the incoming yarn onto the spool 3 and also drives this spool, are operated, in the conventional man} ner', to cause drum 2 to runtemporarily at slow speed in the reverse direction, as is indicated by the time curve so. During such return movement, the suction tube 7 sucks the yarn end, previously run onto the spool 3', as

it returns back to the guidingdrum 2. As this is being:

lifted, also as apparent from time curve 41; and transfers the cop into the position 25.

As mentioned above, the starting. end oftlie cop, when in position 25b, was previously pulled off by the suction end 15 of lever 13 and occupied the position F* prior to the release of mp 255 and its'subsequent transfer into the position of cop' 25. Consequently, the discharge of the cop from the magazine and its transfer into the position 25 shifts the startingend of the yarn from the position F" to the position F. Before or during the movemerit ofth'e cop into the position 25 in the manner just described; the suction lever 9 moves downward to its lowermost position, in accordance with the time curve 33'. After the cop is in position 25 and the starting. end of the yarn has shifted from position F" to position F", the lever 9'mov'es upwardly back to its original position. On its wayhack the suction end II of lever 9 seizes the yarn. and F" a'ndinovesit in the direction toward thetying device 35-, as, is more fully described in the German Patent 9231415 resp.- US Patent 2,769,599: At about the same time, the suction tuhe 7 turns from its full line positionft'o the dotted line position 7 togetherwith the yarn end' c'omingafror'n he take-up spool 3, this yarn end beingflbcate'din the interior ofthe suction tube '7. Thus the yarn (and F of the takewup spoolis likewise supplied to the tying. device The starting end-coming is diverted by the suction tube 7, rotatingclocliwise into shearer) position 7', in such a manner that the yarn from cop 25 occupies the position F The starting end, however, remains in device 11 and the thread therefrom is drawn across the knotter 35 by tube 7 in order to be tied. As a result, the two yarn ends F and F" coming from the yarn-supplying cop 25 and the take-up spool 3 respectively are now arranged side by side in the tying device 35 so that they can be knotted together in known manner. In the meantime, the yarn-guiding drum 2 has stopped, as indicated by portion 36 of time curve 36. The tying device 35 is now operated according to time curve 39 in Fig. 3, while the guiding drum 3 and the spool 2 remain temporarily at rest.

During the last part of the automatic coil-exchanging operation, the suction lever 13 turns into the position 13, according to time curve 42 in Fig. 3. Since, in the meantime, the next following cop in magazine 29 has advanced into the position 25b, the suction head 15 of lever 13 can again seize the starting end 28 of the next following cop, now in ready position, and can move the starting end P of the yarn into the ready position illustrated in Fig. l. 1

Near the end of the coil-exchanging interval, the thread-guiding drum 2 is again caused to run in the forward direction as shown in portion 36" of time curve 36.

It will be recognized that during the entire winding period which follows the coil-exchanging operation just described, and during which period the yarn from cop 25 is wound on spool 3, the starting end of the lowermost reserve cop 25b in magazine 26' is kept in the ready position shown at F in Fig. 1. Consequently, during the entire period of the winding operation, the person supervising can inspect the starting end F in order to determine whether it is in proper and ready position; and, if necessary, the person operating can eliminate any failure of or defect in the yarn finding and seizing operation with sufficient speed so that interruption of the winding operation is not required. In its ready position, the yarn end F' is diverted, or deflected to the left, by the yarn-guiding lever so that the suction head 15 cannot pull the yarn over the head of the cop. When the suction lever 13 with its head 15 moves downwardly, the noses 17 and 18 force the yarn-guiding lever 20 toward the right (Fig. 4) so that it turns clockwise about the pivot 19. The lever end 21 serves as a stop for limiting the travelling motion of the yarn-guiding lever 20 when it is turned counterclockwise into the yarn-deflecting position illustrated in Fig. 1, such return movement being effected by means of a biasing spring 191. Lever 24] has a yarndeflecting cross-arm 260 but is open below to allow the yarn to move out when the cop leaves the magazine. The transfer of the thread from position .F' to position F is automatic. When, during exchange of a coil and after the depleted quill or core of the coil 25 is eliminated, a coil 25b is released from the magazine, then this coil slides into the position 25'. In doing so, it drags the yarn along until the trailing portion of yarn has the required length, if necessary even by unwinding one turn from the coil. The deflector arm 20! extending transversely.

from lever 20, is not a closed ring, and therefore the thread can easily exit through the opening at the left side of transverse arm 200 (see Fig. 7). Consequently, the thread passes automatically from position F to position F while the coil 25b is sliding downwardly.

The cycle of steps described above is initiated by a yarn sensing device. This device may be an adjunct of the tensioner 22 and be so designed that it senses when the yarn is not present in the tensioner 22, or it may be the sensing device described in said German patent resp. US. 2,769,599. When the yarn end is pulled off the cop 255 the sensing device operates a motor drive (not shown) to turn thorn 27 clockwise, or counterclockwise, to drop the empty cop 25 off the thorn in a manner known in the art. The thorn is then moved into position to receive shown in full lines in Fig. 1, the yarn filament being at,

F. When the thorn is in position to receive the next full cop the cycle of steps described above is initiated, preferably automatically, and terminates with the arm 13 again in upraised position. This sequence of operations is carried out automatically by conventional rotary cam driven mechanisms; for example, as indicated in Figs. 5 and 6. The layout of the cams is obvious from motion diagram 3. As shown in Fig. 5, the gear system 101 to 104 is automatically controlled by cam 360 through gear shift cam follower lever 105 to operate the drum 2 in forward or in slow reverse. Power is derived from shaft 100 through longitudinally movable gears 101 or 102, and gears 103 or 104. Shaft 361 is independently driven, or from shaft through a clutch and reduction gears, not shown, and its motion is initiated and terminated by the said sensing device. The cam 400 on shaft 361 operates the lever 33 to control the position of stop 31, by pivoting lever 330 on pin 331. Three other cams: 401, 492, 403 and follower levers 4531, 402', 403' are employed, being also operated by shaft 361, to produce the sequence of motions described above for arms 7, 9, and 13. A cam, or gears, connected to shaft 361 can be used to oscillate or rotate thorn pivot 26. The automatic knotting mechanism is known and described in prior patents, and its correlation with the movements of arms 7 and 9 is obvious therefore, through gearing or cam actuated elements, or by both, which can be operated by or in coordination with shaft 361.

It Will be obvious to those skilled in the art, upon a study of this disclosure, that the invention is not limited to the particular embodiment described and illustrated herein, but may be modified without departing from the essential principal and features of the invention, and within the scope of the claims annexed hereto.

We claim:

1. In an automatic machine for processing a textile filament taken from a filament-supplying coil stationed thereon which coil is automatically replaced when depleted by a replenishing filament coil having a starting end disposed in the form of turns on an end thereof, an automatic filament end tieing device to tie said starting end to an end of the filament removed from the depleted coil, gripping means movable into position to seize the starting end of the filament of the replenishing coil, means to ready said replenishing coil into position within range of the gripping means so that it may be so seized, automatic means to move the gripper means and the seized starting end to a predetermined ready position where the seized end is stationed in readiness for a subsequent filament end tieing operation, automatic means for subsequently removing said starting end from said predetermined ready position to the tieing device, means operative when the gripper means is in said ready position to hinder further unwinding of the filament end from the said replenishing coil until the latter replaces the depleted coil.

2. The apparatus described in claim 1, the last mentioned means comprising a movable device having a filament deflecting portion, means carried by the gripper means which moves the filament deflecting portion out of contact with the filament when the gripper means is in filament end seizing position, the device having a free space opposite the deflecting portion, in which space the filament is free to move to free it from the deflecting portion when the replenishing coil replaces the depleted coil.

3. In an automatic winding machine for rewinding, on a spool, a textile filament taken from a filament-supplying coil stationed thereon which coil is automatically replaced when depleted by a replenishing filament coil having a starting end disposed in the form of turns on an end thereof, an automatic filament end tieing device to tie said starting end to an end of the filament removed from the depleted coil, suction gripping means movable into position to seize the starting end of the filament of the replenishing coil, automatic means to ready said replenishing coil into position within range of the gripping means so that it may be so seized, automatic means to move said suction gripper means and the seized starting end to a predetermined ready position where the seized end is in readiness for a subsequent filament end tieing operation, automatic suction gripper means for subsequently removing said starting end from said predetermined ready position to the tieing device, the first suction gripping means being thereafter automatically moved into position to seize the starting end of the filament of the next replenishing coil and then being automatically returned to and kept in the predetermined ready position, and automatic suction gripping means for returning a filament from the spool to the tieing device, means operative when the first suction gripper means is in said ready position to hinder further unwinding of the filament end from the saitli replenishing coil until the latter replaces the depleted coi 4. An apparatus for rewinding a textile filament from a cop onto a spool, means to receive a filament carrying cop and to support it while the filament is unwound therefrom onto the spool, a magazine having means to position a series of filament carrying cops, each positioned cop having a filament end on an end thereof, a filament end tieing device, means to return a filament end from the spool to the tieing device, means to feed a filament end from a replacement filament carrying cop to the tieing device, the latter means including a suction means movable into a first position to suck and remove a filament end from a cop positioned in the magazine, the cops successively moving into range of the suction means, the suction means being movable into a second position in which the removed filament end is readied for a subsequent filament end removal and tieing operation, a filament defleeting means which is operative When the suction means is in said readied position to hinder further unwinding of the filament end from the said cop while the latter is positioned in the magazine.

5. The apparatus described in claim 4, the filament deflecting means comprising a lever having a filament deflecting portion, means carried by the suction means operative while in the first position to pivot the lever to move the deflecting portion away from filament defleeting position, the lever returning to filament deflecting position when the suction means is moved to the ready position.

6. An apparatus for rewinding a textile filament from a cop onto a rotatable spool, comprising a rotatable filament guiding element adjacent 'the spool, the turning of the guiding element also turning the spool, a filament tieing device, means for reversing the direction of rotation of the guiding element to return a filament end, first suction applying means to suck a filament end as the filament end turns back from the spool toward the guiding element and to move the said filament end to ,the filament tieing device, pivoted means to receive a filament carrying cop and to support it while the filament is unwound therefrom onto the spool, said pivoted means being turnable on its pivot to position it for reception of the next filament carrying cop, a magazine to position a number of filament carrying cops, means to supply one of said cops to the pivoted receiving means, second suction means movable into a first position to suck and remove a filament end'from said one cop positioned in the magazine, the second suction means being movable into a second position in which the removed filament end is readied for a subsequent filament tieing operation, filament deflecting means which is operative when the second suction means is in said readied position to hinder further unwinding of the filament end from the said one cop while the latter is positioned in the 8-.- magazine and which is inoperative to hinder unwinding.- when the said cop leaves the magazine. f; a 7. The apparatus described in claim 6, the filament dew: fleeting means comprising a lever having a filament dc fleeting portion, means carried by the second suctionmeans operative while in the first position to pivot the; lever to move the deflecting portion away fromfilament deflecting position, the lever returning to filament de-; fleeting position when the second suction means is moved to the second position.

8. An apparatus for rewinding a textile filament from a cop onto a rotatable spool/the apparatus compris-' ing a rotatable filament guiding element adjacent the: spool, the turning of the guiding element also turning the spool, a filament tieing device, means for reversing the direction of rotation of the guiding element to re, turn a filament end, first suction applying means to suck a filament end as the filament end returns from the spool toward the guiding element and to move the said sucked filament end to the filament tieing device, pivoted means to receive a filament carrying cop and to support it while the filament is unwound therefrom onto the spool, said pivotedmeans being turnable on its pivot to position it for reception of the next filament carrying cop, a. magazine to position a number of filament carrying cops; means to supply one of said cops from the magazine to the pivoted receiving means, second suction means movable into position to suck and remove a filament end from said one cop positioned in the magazine, thecops. successively moving into range of the second. suction means, the second suction means being movable into and stationed in a second position in which the removed filament end is readied for a subsequent filament removal and tieing cycle of operation, the second suction means remaining stationed in said second position until said subsequent cycle of operation is initiated to "replace a filament depleted cop on said pivoted means by a filament carrying cop from the magazine.

9. An apparatus for rewinding a textile. filament from: a cop onto a rotatable spool, the apparatus comprising a rotatable filament guiding element adjacent the spool, the turning of the guiding element also turning the spool, a filament tieing device, means for reversing the direction of rotation of the guiding element to return a filament end, first suction applying means to sucka filament end as the filament end returns from the spool toward the guiding element and to move the said sucked filament end to the filament tieing device, pivoted means to receive a filament carrying cop and to support it while the filament is unwound therefrom onto the spool, said pivoted means being turnable on its pivot to position it for reception of the next filament carrying cop, a maga-T zine to position a number of filament carrying cops, means to supply one of said cops from the magazine to the pivoted receiving means, second suction means movable into position to suck and remove a filament end from said one cop positioned in the magazine, the cops successively moving into range of the second suction means, the second suction means being movable into and stationed in a second position in which the removed filament end is readied for a subsequent filament removal and tieing cycle of operation, the second suction means remaining stationed in said second position until said subsequent cycle of operation is initiated to replace a filament depleted cop on said pivoted means'by a filament carrying cop from the magazine, third suction means movable into position, when the said one cop has left the magazine, to move the removed and readied filament end toward the filament tieing device, stop means abutting said one cop to maintain it in said magazine, means to remove said stop means to permit said cop to move to the pivoted receiving means. 1

10-. In an automatic apparatus for rewinding a textilefilament from a cop to a rotatable spool, the apparatus comprising a rotatable filament guiding element adjacent the spool, the turning of the guiding element also turning the spool, a filament tieing device, means for reversing the direction of rotation of the guiding element to return a filament end, gripper means to seize a filament end as the filament turns back from the spool toward the guiding element and to move the said filament end to the filament tieing device, means to receive a filament carrying cop and to support it while the filament is unwound therefrom onto the spool, said means to receive being movable to position it for reception of the next filament carrying cop, a magazine to position a number of filament carrying cops, means to supply one of said cops to the said means to receive, second gripper means movable into position to seize and remove a filament end from said one cop positioned in the magazine, the second gripper means being movable into a second position in which the removed filament end is readied for a subsequent tieing operation, means operative when the second gripper means is in said readied position to hinder further unwinding of the filament end from the said one cop while the latter is positioned in the magazine, the last mentioned means being inoperative when the said one cop is positioned on the means to receive.

11. The apparatus described in claim 10, the last mentioned means being a lever having filament deflecting means, the second gripper means carrying an element which pivots the lever to move the deflecting means away from the filament end of said one cop when the gripper means is positioned to seize said filament end.

References Cited in the file of this patent UNITED STATES PATENTS 1,227,754 Colman May 29, 1917 2,208,930 Kalisch July 23, 1940 2,670,150 Perry Feb. 23, 1954 2,685,413 Reiners Aug. 3, 1954 2,769,599 Furst Nov. 6, 1956 FOREIGN PATENTS 135,743 Sweden Mar. 13, 1952 306,841 Switzerland July 1, 1955 

